Newer Technologies, XLR8, Sonnet Technologies, and Powerlogix have all announced G4 upgrades for PCI based PowerMacs. Powerlogix has taken it one step further by demoing one of their cards at Seybold. According to Powerlogix:

PowerLogix unveiled the first G4 processor upgrade at the Seybold Expo in San Francisco.

"We're proud to be the first and only upgrade manufacturer to demonstrate the capabilities of G4 right alongside Apple's new G4 machines," said Robin Sharp, Director of Marketing. "For many users, a processor upgrade, whether it be G3 or G4, is the best, most economical choice."

The PowerForce G4 brings the power of Motorola's AltiVec Technology (called "Velocity Engine" by Apple) to earlier PowerMacs and clones.